Keystones — Lintel
Five GCSE retrieval questions · 19 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00069 in standard form
Answer: 6.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x + 3
Answer: (x + 3)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.51cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 1:1:3
Answer: 18, 18 and 54 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 39, 44, 30, 19, what is the missing number?
Answer: 33